Answer:
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Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite. It most commonly forms in clear, warm, shallow marine waters. It is usually an organic sedimentary rock that forms from the accumulation of shell, coral, algal, and fecal debris.
Answer:
burning of fossil fuels
Explanation:
acid rain is caused by the air pollution from the burning of fossil fuels
Answer:
A SPECT tomography or a PET tomography
Explanation:
Tracers are substances that have been labeled with a radioactive atom which emits radioactive gamma-ray or positron signals that can be detected in a scan, thus pinpointing the area where they accumulate and allowing the health personnel to identify the part of the organ that is affected or that is carrying out a specific function. The detection is carried out by a SPECT scan (Single Photon Emission Computed Tomography) or a PET scan (Positron Emission Tomography). PET scans are commonly used to detect areas where glucose utilization is increased, such as in cancer cells. Also PET is commonly used in the diagnosis of Alzheimer's disease, so it is likely that Rosa will receive a PET scan.